Is Peptide Sciences Legit
Is Peptide Sciences a legit peptide vendor? 132 independent lab tests across 10 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Lab record: Mixed
How we rate- 132 independent tests
- 37 of 111 lots filled to label
- Median purity 99.71%
- 5 of 9 products graded D or E
Some of Peptide Sciences's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tirzepatide
Peptide Sciences graded E. Paradigm Peptide's Tirzepatide graded A across 10 tests, $4.97 / mg.
Buy from Paradigm PeptideAll better-tested optionsPeptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Better-tested options
Where Peptide Sciences graded D or E, these shops' samples of the same peptide graded A or B. Ordered by grade, then price per mg. Partner status never changes the order.
Tirzepatide
Peptide Sciences: grade ERetatrutide
Peptide Sciences: grade EPeptide Sciences products we've tested
Best-graded first. Grades come from the share of each product's samples that passed purity and quantity checks. Buy links open Peptide Sciences' site.
- PT-141AGREAT
- Tests
- 6
- Passed
- 100.0%
- GHK-CuAGREAT
- Tests
- 6
- Passed
- 100.0%
- SemaglutideBGOOD
- Tests
- 15
- Passed
- 86.7%
- IpamorelinBGOOD
- Tests
- 9
- Passed
- 88.9%
- BPC-157DPOOR
- Tests
- 13
- Passed
- 69.2%
- RetatrutideEBAD
- Tests
- 41
- Passed
- 51.2%
- TirzepatideEBAD
- Tests
- 17
- Passed
- 58.8%
- CJC-1295EBAD
- Tests
- 11
- Passed
- 9.1%
- Melanotan IIEBAD
- Tests
- 10
- Passed
- 50.0%
- Tesamorelin—
- Tests
- 4
- Passed
- —
What the testing shows
Across 111 measured samples from Peptide Sciences, 74 came in more than 5% under the quantity on the label (67%). Another 14 measured more than 5% over. Purity across 112 readings ran from 98.62% to 100%, median 99.71%. Samples span Dec 2024 to Jul 2026.
- Under label
- 74/111
- Median purity
- 99.71%
- Latest sample
- Jul 2026
more than 5% short
98.62%–100% range
first tested Dec 2024
Our read on Peptide Sciences
79 of Peptide Sciences' 132 graded samples passed (60%), and 27% of all samples were sent in by buyers rather than by the shop.
Results are slipping: 52% passed over the latest six months, down from 61% before.
When a sample failed, the most common reason was purity under 99.5% (31 times).
20 samples failed identity, meaning the lab could not confirm the vial held the labelled peptide.
Against the 302 shops with at least five graded tests, Peptide Sciences' pass rate is at or above 22% of them, and it has more tests on record than 94% of them.
When and how Peptide Sciences was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Chromate (28), TrustPointe (28), Krause Analytical (25), MZ Biolabs (19)
- Who sent the samples
- buyers 27%, testing programme 73%
- Batches covered
- 38 distinct batch numbers; 3 checked for endotoxins
Why Peptide Sciences' failed samples failed
The 6 most recent failed tests, with the lab's reason.
Tesamorelin · Jul 20, 2026
the lab could not confirm it was the labelled peptide
CJC-1295 No DAC · May 6, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Apr 28, 2026
the lab could not confirm it was the labelled peptide
Tesamorelin · Apr 28, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Apr 28, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Apr 2, 2026
the lab could not confirm it was the labelled peptide
Lab testing results
Independent results across 10 products.
Individual lab tests
Date
7/1/2026
Purity
99.9%
Quantity
60 mg → 61.8 mg
Lab
Krause Analytical
Vial
White label / Silver crimp / Orange cap
Date
6/17/2026
Purity
99.8%
Quantity
12 mg → 13.3 mg
Lab
BTLabs
Vial
White label / Blue crimp / Brown cap
Date
5/6/2026
Purity
—
Quantity
—
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Clear Cap
Date
4/28/2026
Purity
—
Quantity
—
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Clear Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| Tesamorelin | 7/20/2026 | — | — | Krause Analytical | View | |
| TirzepatideWhite label / Silver crimp / Orange cap | 7/1/2026 | 10.0 | 99.9% | 60 mg → 61.8 mg | Krause Analytical | View |
| RetatrutideWhite label / Blue crimp / Brown cap | 6/17/2026 | 10.0 | 99.8% | 12 mg → 13.3 mg | BTLabs | View |
| CJC-1295White Label / Silver Crimp / Clear Cap | 5/6/2026 | — | — | Krause Analytical | View | |
| RetatrutideWhite Label / Silver Crimp / Clear Cap | 4/28/2026 | — | — | Krause Analytical | View |
Which Peptide Sciences products tested best
PT-141, GHK-Cu, Ipamorelin and Semaglutide have the strongest record, graded A or B.
BPC-157, Tirzepatide, Retatrutide, Melanotan II and CJC-1295 graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Peptide Sciences
If you order from Peptide Sciences, the A- and B-graded products are the safer picks on this record. For the weaker ones, the better-tested options on this page come from other shops.
We don't track Peptide Sciences' prices yet. Shipping, payment and refund terms are on their site.
The official store is www.peptidesciences.com/buy-peptides. Check the address before you pay.
What to check before you pay
- The lot number on the vial matches the certificate
- The certificate names the lab and the test date
- Fill versus label, not purity alone
- A refund policy in writing
Track Peptide Sciences
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Peptide Sciences: common questions
Is Peptide Sciences legit?
We rate lab records, not businesses. Mixed lab record: 132 independent tests, 37 of 111 lots filled to label, median purity 99.71%, 5 of 9 products graded D or E. Each result links to its original certificate in the table above.
What do Peptide Sciences reviews say?
We don't hold scored customer reviews for Peptide Sciences yet. The independent lab results on this page are the evidence we have.
Which Peptide Sciences peptides tested best?
We have graded 9 Peptide Sciences products. PT-141, GHK-Cu, Ipamorelin and Semaglutide graded A or B. BPC-157, Tirzepatide, Retatrutide, Melanotan II and CJC-1295 graded D or E.
Is there a Peptide Sciences coupon code?
We don't have a verified Peptide Sciences coupon code. A discount changes the price, not what is in the vial.
Ordering from Peptide Sciences?
Mixed lab record: 132 independent tests, 37 of 111 lots filled to label, median purity 99.71%, 5 of 9 products graded D or E.
About Peptide Sciences
On 6 Mar 2026, Peptide Sciences announced it stopped trading. Further purchases from this brand are fraudulent.
Contact
- US: NV 89052
- www.peptidesciences.com/buy-peptides